Automatic altimeter setting indicator and transmitter



D ATLAS Nov. 15, 1949 3 Sheets-Sheet l Filed Jan. 29, "94B wf www W l /M M Mw 7 a a. pw@ mmf 55A Wwf w e ,w w V M y A @y j Y M 1 i I E LL Wj IEEE Werf

D. ATLAS Nov. l5, 1949 AUTOMATIC ALTIMETER SETTING INDICATOR AND TRANSMITTER Filed Jan. 29, 1948 3 Sheets-Sheet 2 z /Mffe Jf/f//v /m/a I I I l I I I I I l l I I I I I I I l I I l I l BVM/ML D. ATLAS Nov. 15, 1949 AUTOMATIC ALTIMETER SETTING INDICATOR AND TRANSMITTR Filed Jan. 29, 1948 3 mam-sheet 3 sm ml INVENTOR. p/f7.5' /l/g-/n N M M4 e Puh i. H7 Q.

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UNITED STATE ammo l AUTOMATIC Alam SETTING INDI- TRANSMITTER CATOB AND Davia alla. man. n. Y.

application :maar: 29. me. serial No. 5.150 'l oisans. (ci. rrr-esiliV (Granted under the set of March dell Aprll 30, N28; 370 0. G. 757) 'nie invention described herein may be manuof any rc-yalty thereon. Y

This invention relates to electrically operated, automatic intelligence transmitting systems or devices and more particularly to such an intelligence transmitting means for use at ground level as a beacon installation or at an airport as applied to homing operations.

During the nights of airplanes along established routes in the past, considerable aggregate loss in lives and property has been caused over rough and mountainous terrain due to the absence of accurate night infomation, as for example elevational data at unequipped obstacles. high ridges, peaks and the like along the route. Losses of this general type that have occurred in the past along mail and passenger routes over mountainous regions are believed. to be avoidable in the future by operation of the present invention.

The present invention is directed toward the future avoidance of losses by providing a device adapted for being mounted as a beacon upon an equipped obstacle, such as' a dangerous mountain ridge or peak orl upon any high promontory along the night course. The device is adapted to be attended or unattended by human agency as preferred, although periodic checking of the accuracy of the operation ofthe equipment is an essential in either type of installation, When Vunattended the device may be caused to broadcast its report only upon the receipt of an actuating signal,- thereby conserving v electrical energy used in the broadcasting operations and hence extending the time between the replacing ,ofener'gy supplying equipment, or the device may pilot. the ground operator speaks into a microphone and gives the airplane pilot orally the infomation that he has requested. The uniform pattern of information requested and so supplied normally includes the name of the neld: weather conditions at the neld; instrument readings at ground level at the neld,such as the barometric pressure or altimeter reading from which the airplane pilot may set the altimeter in his piane as a preparatory measure to making a safe landing; the ceiling, visibility, wind direction and wind speed at ground level and such other related information as is particularly needed by the pilot for him to accomplish a safe and accurate landing operation, The present invention is broadly a system and a device for supplying to an airborne pilot in oral form and with a high degree of accuracy, recurrent information needed by him in night or during a homing operation.

As the pilot approaches a neld in a homing operation it is necessary that he have an accurate ground level altimeter reading for his use in settingl the altimeter in his airplane so that he may accomplish a smooth landing at ground level.

The receipt by the airplane pilotof information of this type is essential for his own safety and for the safety of his passengers and his plane during the landing operation. Since the altimbroadcast its report repetitiously in a desired manner, as by the operation of clockwork or the like.

During landing operations at an airport it has been common practice in the past for landing information to be transmitted orally by the use of audio radio equipment between a pilot making an aircraft homing operation and a radio operator on the ground at the landing. neld. During these operations certain types of information is recurrent in the sense that it is requested by every pilot approaching the neld for a landing.

In a homing operation, the airplane pilot speaks into a microphone and requests orally of the operator on the ground at the landing neld certain information that he needs to make a safe and accurate landing. In answering the eter is a barometric device it must be corrected from time to time for variations in atmospheric pressure which occur with changes in temperature and hence in weather conditions as well as with changes in elevation.

Aircraft tranic is controlled by assignments of night altitudes and spacing of aircraft. lThis tranlc control is of importance in avoiding collisions, particularly at congested landing holds. 'Ihis tranlc control also applies to travel along popular routes. In the interests of optimum safety and performance, the periodic checking of 4altimeter.' settings and the reception by the pilot of other necessary night information is of considerable importance.

For the purpose of disclosing or describing a representative operative embodiment of the present invention, an electrically operated automatic intelligence transmitting device for use in ground-air communication during, for example, a landing operation and accomplishing beacon or neld identincation, an altimeter setting report and the like, from an airport ground station to a homing pilot is presented herein as being an illustrative adaptation of the present invention.

The disclosed device for accomplishing the stated result is essentially an automatically operating instrument having an indicator arm so modied as to adapt it as an operative component in an electrical circuit coupled with a wire recorder applying its output tov a transmitter as audio modulationon a carrier that y'is to be intercepted by an airborne pilot in 'the form of spoken words imparting to the pilot accurate instrument readings at the ground level and such other informationl as will supply his needs,

An object of the present invention is to provide.`

a system for intercommunication in the transmission of instrument readings substantially Without requiring the intervention of a human operator in accomplishing the'transmission.

Another object is to provide an instrument reading and announcing device that is substantially independent of the human factor in the' accuracy of its operation when properly adjusted.

A further object is to provide an instrument reading and announcing system that is capable of a high degree of accuracy and promptness in reading. transmitting and announcing an instrument reading at a point remote from where it was taken.

A further object is to provide ground apparatus for use by an airplane pilot in flight and in homing operations, that may be started from the air or at the ground as preferred, and that imparts to the homing pilot accurate information of a recurrent nature such as beacon or eld identification, altimeter readings at ground level, wind speed, wind direction, visibility and the like, substantially at the instant the request is made.

With the above and other objects in view that will be apparent from the following description, an illustrative embodiment of the present invention, particularly as applied to a barometric instrument or altimeter 'reading announcing device for use at airports, is shown in the accompanying drawings, wherein:

Fig. 1 is a block .circuit diagram that embodies the present invention and that indicates sequential electrical equipment adapted for reporting automatically andorally altimeter settings from a ground position;

Fig. 2 is a circuit block diagram that is an expansion of the diagram shown in Fig. 1 in that it is of multi-channel type;

Fig. 3 is a fragmentary structural and circuit diagram comprising an altimeter shown in plan view associated in simplified form and in a sequential operative relationship with electronic equipment presented in block diagram form in Fig. 1;

Fig. 4 is an enlarged fragmentary sectional view taken from the line 4-4 in Fig. 3;

Fig. 5 is an enlarged fragmentary elevational view, partly diagrammatic, taken from the line 5 5 in Fig. 3;

Fig. 6 is an enlarged plan view of a sequential cam that ronsecutivelv closes sequential contacts shown in Figs. 3 and 7;

Fig. '7 is a fragmentary circuit diagram of the connections in a modified multi-channel wire reproducer and sequencer shown in block diagram form in Fig. 2; and

Fig. 8 is a circuit diagram of a system of electrical junctions and connections for a plurality of modified weather instruments shown in block diagram in Fig. 2. y

A ground installation embodying the present invention as applied to an altimeter setting indicator responsive to signal from airborne radio equipment is shown in block diagram form in Fig.

mainder of 1 of the accompanying drawings. The equipment 75 shown may be installed on a dangerous ridge. peak or the like, in rough terrain to warn a pilot of a dangerous promontory along his route or flight course, or it may be installed at an airport for use by pilots approaching the ileld or airport in the making of homing operation.

The apparatus shown in Fig. l comprises `an instrument, such as an altimeter setting indicator 5l) presenting separate outputs to a sequencer Il and to a modified multi-channel wire reproducer 52. The altimeter 5U is connected through lead 54 and connector 59 to the reproducer 52. The output from the sequencer 5| is applied to both the Wire reproducer 52 and, through a lead |21 to a transmitter 53. The wire reproducer Il passes its output to the communications transmitter 53.

Operatively, when a pilot transmits an apparatus actuating signal to a beacon on an equipped obstacle or to a landing iield at both of which places the apparatus shown in Fig. 1 is established, the apparatus actuating signal triggers into action an instrument such as the altimeter setting indicator 50 and thereby actuates the rethe system at the ground station. The resulting operation of the system is initiated almost instantaneously after the actuating signal is received at the ground station. The apparatus shown in Fig. 1 may be attended or unattended depending upon its components. Where unattended the apparatus may respond to an actuating signal in a usual manner, such as by being applied to a suitable channeling circuit, not shown, or the apparatus may broadcast periodically or repetitiously as by the use of clockwork, not shown, or the like. Where the apparatus is attended, response to a request from an airborne pilot may be made by the manual depressionpf a button or by the closing of a switch at the ground station or the like.

The origin of intelligence from the altimeter setting indicator 5U preparatory to its transmission is sequentially spaced in order and in time by operation of the sequencer 5i and is applied by the altimeter setting indicator 50 to the modified multichannel wire reproducer 52 for transmission as audio modulation of a carrier transmitted from the communications transmitter 53. In short, when an aircraft pilot sends an actuating signal to the apparatus shown and positioned on the ground, he receives back in spoken words the setting of an instrument part of the apparatus such as the barometric pressure or the altimeter setting at the ground level Where the apparatus shown in Fig. 1 is positioned without the necessity of human interjection between the sending of the actuating signal by the pilot and, in response thereto, his receipt of the desired information. The apparatus shown in`Fig. 1 is a simple system supplying to a pilot the single instrument information of an altimeter or barometer reading at ground level. The circuit shown in block diagram form in Fig. 1 is included in the circuit and apparatus shown in Fig. 3 of the drawings with respect to which its operation is more fully described.

The circuit block diagram shown in Fig. 2 is that of a ground installation essentially resembling that shown in Fig. l adapted for transmitting a desired number of multiple readings or pieces of information from a desired plurality o! instruments. The apparatus shown in Fig. 2 comprises broadly a set of modied weather instruments coupled to an automatic instrument reader 4| that applies its output to a communications transmitter 63 for `transmission to` an interrogating pilot. The relationship between the components thatare common to both ll'igs. I and 2v is indicated bythe use of numeralsthat are common to both figures" but the more distinct oi which are primed'inFig. 2. l

The modified weatherV instruments vl comprise a ldesired plurality `of instruments such as an altimeter setting indicator 50, a ceilometer 55, a visibility meter 56, an anemometer 51, a wind vane 50 and the like, thatr are connected separately by connectors |50, |55, |56, |51, |56, etc. respectively, to a sequencer 5|. These instrufments also are connected by a conductor or cable 56 through a. connector 5,9' into a modified multichannel wire reproducer 52 in the automatic instrument reader 4|. The sequencer'5l' has its outputv applied to the wire reproducer 52' and has 'I'he motor 93 drives a wire drumin the reproducer 52' and a sequencer cam 10 in the `sequencer 5| The sequencer cam consecutively actuates the I sequenti'alswitches 61, 66,65, etc., inthe system a transmission starting conductor |21 leading to the transmitter 53. The output from the wire reproducer 52' isv passed through a signal generator jack |23 tothe communications transmitter 53 which l,broadcasts signal to the interrogating pilot.

. In the operation of the system that is illustrated in Fig. 2 of the accompanying drawings the various instruments in the group of modiiied weather instruments 40 in a sequential order and timed consecutively by operation of the sequencer 5|' apply their outputs as separate readings through the coupling or connector 59 to the wire reproducer 52'.- These separate readings are consecutively passed from the wire reproducer 52' to the communicatipns transmitter 53 for transmission-as audio modulation of a radio carrier for reception by the interrogating pilot. In this manner the pilot receives in word. form and .in orderly manner one after the other the readings from each dial of the modiiled weather instruments 60.

The apparatus and circuit arrangement shown in Fig. 3 of the drawings is illustrative of the circuit shown in Fig. 1 or of the circuit of one oi the instruments shown in the group of modiiled weather instruments 40 in Fig. 2, such as the altimeter setting indicator for example. The circuit shown in Fig. 3 is restricted to that for making a single instrument reading in the interests of simplicity and clarity oi presentation. Con- 5| is connected to the transmitter 53 by a pair f oi leads |21 that serve to initiate theoperation o! the transmitter. The wire reproducer 52 has its output applied through the connector |23 to the communications vtransmitter 53 for signal transmission to they interrogating pilot. Each cycle of transmission is initiated by the depression of a key or switch |02- in the sequencer 5|' and is ended when a cam riser 12 on a sequential cam 10 opens a normally closed relay locking switch' 36. The cam 10 is rotated by a motor 93.

The sequencer 5| comprises the cycle starting switch |02, the relay holding relay winding 90. with its associated switches and the motor driving relay winding |04 with its associated switches that start up the transmitter 53 and the motor 93.

during'each cycle of operation and finally terminates each cycle by opening the switch 6 6 and thereby de-energizing-,the rely vholding relay winding 96.'

The groundsupplying connector |50 between the altimeter setting indicator 50 and the sequencer 5|' connects the instrument contact rings 6 2, 63,` and 64 with the corresponding number of ganged sequential switches 61, 66, and 65,

respectively, to which a common ground is applied when the ground switch 01 is closed.

During a cycle the sequential cam 10. consecutively closes a desired plurality of-normally open sequential switches in the sequencer 5|'. 0f these sequential switches,-the three switches65, 66 and 61 serving three ring contacts 64, 63 and 62 of the altimeter setting indicator 50 as a representative instrument, are illustrative. l The sequential switches consecutively complete instrument reading circuits through the altimeter 50 and such other instruments as are installed at a particular installation to an instrument reading reproducer, such as the reproducer 52' that causes the instrument readings to be transmitted to the interrogating pilot from the transmitter 53.

The altimeter setting indicator 50 comprises'a dial 60 of an electrically-insulation material that is calibrated upon its face in a usual manner to read altimeter settings, but that iszso modiiied as to make the calibrations electrically conductive and insulated from each other. The instrument dial 60 has an altimeter setting indicating arm 6| yieldingly supported and rotatably mounted on a spindle 13 atthe center'of the dial to sweep the instrument readings on the face thereof. The altimeter setting indicating arm 6| is rotatably actuated for indicating barometric pressures byv .ring' contacts has a separate connector leading into the jack-in-plug ground supplying connector |50 between the altimeter setting indicator 50 and the three sequential switches 65, 66, and 61 inv A desired plurality of long sector units contacts, n

of which vthe contact 1| indicating 30 inches of mercury atmospheric pressure may be taken as being illustrative, are deposited between and are insulated from the ring contacts 62 and 63 as well as being insulated from each other. In Fig'. 3 of the drawings three units contacts are shown and read in clockwise order 28, 29,` and 30 inches of y mercury atmospheric pressure around the instrument dial 60. The units contact 1| indicates the numeral 0 or 30 inches of rmercury and is con.-

nected to the zero contact of aten terminal junction |40 part of the connector ibetween the 4altimeter setting indicator 50 and the wire reproducer 52.

Circumferentially within the angular arc sub- V29.19, 29.29, etc. and 30.09, 30.19, 30.29, etc.

tended by each or the una Contact reading 2s, 29, 30 and 31 inches of mercury are ten tenths contacts reading in tenths of one' inch of mercury.

.Radially outwardly from the units contact 1| and within the same angular sector -are ten equal tenths sector contacts, of which tenths sector contacts 16 and 16 are illustrative. The ten shorter tenths contacts are individually of equal length and are positioned between the ring contacts 68, and 64. The tenths` contacts are inabove the contact calibrations on the instrument sulated from the ring contacts as well as from..

each other and are connected to the terminal junction |40. Circumferentially Within the angular arc subtended by each of the tenths contacts, of which the tenths contact 15, is illustrative, are disposed ten shorter hundredths contacts of equal circumferential dimension. The hundredths contacts are positioned radially outwardly from the ring contact 64 from which the hundredths contacts are insulated as well as being insulated from each other.`

The hundredths contact 11 is illustrative of those within the angular sector of the tenths contact 15 and the hundredths contact 18 is illustrative of -a hundredths contact within the angular sector of the tenths contact 16. Each 'hundredths contact indicates one one-hundredth of one inch of mercury atmospheric pressure.

In short, the units contact 1| describes an arc that is divided outwardly of the units contact 1| dial 60 by means oi a low torque operating mechanism in -response to changes in barometric pressure at the ground level where the instrument is lpositioned. An unattached end 9| of the beam 85 is positioned above a solenoid relay 80.

Upon the energization of the winding 8l o! the solenoid relay 90 the unattached beam end 9| is attracted so that the beam 85 is depressed toward the instrument dial 60. When so depressed, the beam ring portion 81 engages the indicator arm 6| on both sides of its point of support against upwardly directed springpressure and thereby causes the contacts 80, 8| and 82. carriedby the Y arm 6| to separately make connection between hundredths contacts. The units contacts-are between the ring contacts 62 and 63. The tenths contacts are between the ring contacts 63 and 64 andv the hundredths contacts are positioned radially outwardly of the ring contact. or are outermost on the instrument dial 60.

In the embodiment of the invention shown in Fig. 3 oi' the accompanying drawings, the single ten terminal junction in the connector 59' has applied thereto all connections from the instrument dial 60. For example, the units contact 1| indicating zero or 30 inches of mercury atmospheric pressure, is connected in common with all other zero indicating contacts on the instrument dial 60 to the zero terminal of the terminal junction |40. The units sector supplying the reading 29 inches of mercury and preceding the units sector 1| in the clockwise sweep of the instrument arm 6|, is connected to the terminal 9 in the terminal junction |40 along with the tenths sector contacts representing 28.9, 29.9 and 30.9 inches of mercury and the hundredths contacts. indicating 29.09, 28.19, J28.29, etc., 28.09, n short, all contacts on the instrument dial 60 are connected -to correspondingly numbered contacts at the terminal junction |40. All zeros appearing on the dial 60 are connected to lthe zero contact on the terminal junction |40; all ones on the dial 60 are connected to the one contact on the terminal junction |40; continuing to all nines on the dial 60 are connected to the nine contact on the terminal junction |40. The sequential operation of relays in the automatic instrument reader 4| to be described hereinafter controls the oral transmission from transmitter 53 of readings from the dial 60.

The instrument dial 60 has a contact making beam 85 extending diametrically thereacross and normally spaced upwardly therefrom as well as from the instrument indicating arm 6I. One end of the indicating beam 85 is attached by hinge 86 to a suitable insti ament mounting. The contact the ring contacts 82, 63 and 64 and the next calibration indicating contact that is radially outwardly therefrom.

The energlzation of the winding 89 of the relay 90 is accomplished from a B+ power source 88 upon the application of ground thereto through the lead 83 and the closed sequential switches 65, 66, and 61 for accomplishing the sustained engagement of the three separate contacts Il, 8| and 82 carried by the indicator arm 6| during the transmission of a reading from the instrument dial 60 to the interrogating pilot.

Ground is applied to the solenoid relay winding 89 over the lead 83 with the closing of the three sequential switches 65, 66 and 61 when the ground switch 91 in the sequencer 5l' is closed. The sequential switches 61, 66 and 65 are consecutively closed in a predetermined order .through their engagement with the cam riser 12 of the sequencer cam 10 upon the closing of the cycle starting switch |02 in the sequencer 5|'.

The sequencer cam 10 also engages the relay locking switch 96 that is normally closed at the end of each complete rotation. The sequencer cam 10 is mountedon a shaft 94 rotated by the motor 93. The motor 93 through another shaft Il also operates a wire drum, not shown, within the wire reproducer 52'.V The motor 93 runs when motor actuating Yswitch 92 is closed to connect power supply |5| with the iield winding o! the motor 93. l

The motor energizing switch 92 is ganged with switches 91 and 99. -The closing of switch 91 connects ground return to the sequencer switches 65, 66, 61, etc. The closing of the switch 8l energizes the transmitter 53 from a power source, not shown, over the pair of leads |21. 'I'he closing of the switch 91 grounds instrument ring contacts 62, 63 and 64 through connector |50 and supplies ground to the winding 89 of the relay 8l over a conductor 83, as shown in Figs. 3 and 5 o! the drawings.

The energization of the relay winding 89 from B+ power source 88 imparts electromagnetic properties to the solenoid relay 90 such that it attracts as an armature, the unattached end Il of theinstrument beam against the yielding resistance of upwardly directed spring pressure. The upwardly directed spring pressure supports the beam 85 out of contact with the instrument arm 6| to permit the unimpeded movement o! the instrument arm 6| with respect to both the '9 beam tlandtbecontactcalibraticnsontbedial 08. The depression of the unattached end o! the beam 8l around the hinge Il as a center of rotation, depresses Vthe ring 81 part of the beam 8l against the indicator arm 0|. The depressione( the indicator arm 0| causes the separate contacts 88, 1| and'82 to individually engage pairs oi calibration contacts on the instrument dial "such as, for example, the ring 82 and the units contact 1|, the ring 08 and the tenths 4'contact 1l, and the ring 84 and the hun-l y dredths contact 18, respectively.

' The relay locking switch 98 is normally spring pressed closed in its engagement with the cam 10, until it is opened by the cam riser V12, once at the end ot each rotation of the cam 10 to ter'- mlnate an operative cycle of the device. The switch 85 is connected with a rider engaging the peripheral surface of the cam 10 at a peripheral location so that the relay locking switch 85 remains closed until the cam riser 12 lifts the rider and momentarily opens the switch 85. The three sequential switches I5, 88 and 61 are similarly connected with three separate riders engaging the peripheral surfaceof the cam 10 at peripheral locations spaced from each other and from that connected withthe switch 96, so that in point of time the switch'88 is closed then switch 01 is closed long enough for the device to transmit the altimeter units reading, then switch 88 is closed long enough for the device to transmit the altimeter tenths reading, and

4then the switch 85 is closed long enough for the device to transmit the altimeter hundredths reading. The switch 95 has one terminal connected to a terminal of a relay switch |00 and its other terminal connected to one end of al solenoid relay winding 98. The relay winding 88 is energized from a power source |0|. The relay winding 98 is initially energized from the power source |0| by the depression of the normally open cycle starting key or switch |02.

The temporary closing of the key or switch |02 supplies a potential from the power source |0| across the relay winding 98 to close the switches,l |00 and |03. vThe closing of the switch |00, with thev switch 99 in its normally closed position, continues the energization'of the relay winding 98 after the subsequent release and opening of the spring released switch 02. The switch |03 is maintained closed upon and after the closing of the switch |02. The closure of the switch |03 supplies a ground return to the B+ potential power source |05 through and hence maintains energized the relay winding |04. The switch |03 serves as a holding switch for maintaining closed the switches 92, 91 and 99 during the time period between the closing of the switch.

/ ing pilot may send a triggeringsignal of a predetermined frequency to energize an electromagnet or relay winding, such as the winding 89 of the relay 90, to attract the .key or switch |02 in the same manner in which the relay 90 attracts as an armature the unattached end 9| of Vthe upl l0 wardh spring pressed beam 8l part tlmeter setting indicator 80.

One complete rotation of the o! the al- At Q16, start o! each` cycle the switches 82,11, Il, |00,

|88 and 9| are closed and the sequential switches 05, 88. 81 etc. are open. During each cycle the motor 88 is rotating the sequential cam 10 and' the cam riser 12is consecutively and momentarily closing the sequential switches 01. 85. II etc. At the end o1' each cycle the sequential cam riser 12 opens momentarily the switch 08 which deenergizesthe solenoid relay windings 88 and |88, opening theassociated switches and stopping the motor 93. At the end of each cycle the sequential cam riser 'I2 passes beyond the switch 80 so that the switch 89 again closes preparatory to the starting ot another cycle when the starting key |02 isagain closed.

The wire reproducer 52 maybe taken as being illustrative of suitable equipment for applying an audio modulation signal to a carrier. emitted from the transmitter. The wire reproducer 52' comprises a B+ power source |24 applied in parallel to a plurality oi' relay windings of which the relay windings lll, H5 and IIS, corresponding to the numerals 0, 1 and "I on the terminal junction |40, 'may be taken as being representative.

Electrical power from the source |24 is maintained upon the relay windings IH, ||5 and I8, upon the corresponding contacts of the terminal junction |40 in the connector 58 and upon the corresponding 0, l and 7 contacts on the instrument dial 00. When the switch 91 is closed and the beam 6I is depressed this power iiows successively through the relay windings, the oonnector M0,I the contacts on the instrument dial 60, thecontacts 80, 8| and 82 carried by the instrument indicator arm 6|, and through theconnector |50 to the sequential switches 85, 60 and 61 from which it is continued along the connector 14 and through the switch 91 to ground. The sequential order in which ground is applied through switch 91 and the above mentioned connections to the relay windings lll, ||5 and ||8, is that in which the cam riser 12 engages and successively closes the sequential switches l01, 66 and 65.

The reproducer 52' comprises a plurality of relay windings ||4, l i5, ||8 etc. 'separately actu- .ating switches ||0, H6, `||9 etc., respectively.

-The switches ||0, y| I6, |9 etc. are in circuit with wire reproducerpick up heads |3, 1, |20 etc., respectively, 'that are coupled for applying audio modulation to a carrier emitted by the transmitter 53 in a desired manner, as by means of a signal generator ||i and an inductive winding |22 that is attached to the transmitter 53 by conductor |23, or the like. y s

In the operation of the reproducer 52 the successive energization of the relay windings H4, I5, 0 etc., on the application of ground thereto through the altimeter instrument 50 vand sequencer 5|', successively closes the associated switches ||0, H8, ||9 etc., respectively. The conseoutive closing of the switches ||0, H6, ||9 etc., successively causes the wire recorder pick up heads H3, H1, |20 etc. -to play back signal through the signal generator and inductive coupling |22 for application as audio modulation upon a carrier from the .transmitter 53 for interception of the homing pilot.

lThe operation of the device as illustrated in Fig. 3 of the drawings, is initiated in the sequencer sequential cam Il determines one cycle for the device.

nieuwe 5|' by the depression of -the sequencer starting key |02, either manually or upon the arrival of a relay operating signal in known manner, as preferred. The release of the key |02 from its closed to its open position does not interrupt the energization of the solenoid relay winding 90 from the power source during a completecycle of the sequencer cam 10 since the closed switch 98 serves as a holding switch for continuing the energization of the solenoid relay winding 98. The switch |03 serves as a holding switch to maintain ground for the other solenoid relay winding |04 to which power from a power source |05 is applied as long as the switches 98 and |03 remain closed. The energization of the electromagnetic winding |04 closes the ganged switches 92, 91 and 99.

The closing of the switch 92 connects the power supply |5| across the field winding of the motor 93 causing it to start up. The operation of the motor 93 continues during any one cycle of operation and l turns the sequential cam through the shaft 94 and turns wire drums in the wire reproducer 52' through the shaft 95. The switches 92, 91, 99, |00 and |03 remain closed during each rotation of the cam 10 with operative results that have been described previously. The closing of switch 99 causes the transmitter to transmit signal during one complete rotation of the sequencer cam 10. The sequential switches 85, 88, 81 etc. are normally open and are sequentially closed and grounded with the successive closing of the switches by operation of the sequencer cam 10. The winding 89 of the solenoid relay 90 is continuously energized in a similar manner and causes the contacts 80, 8| and 82 to be clamped down by the ring part 81 of the beam 85 against any three particular conductors over which the instrument arm 8| is then positioned by operation of the atmospheric pressure at ground level when the cycle starting key is closed.

The illustrative setting shown in Fig. 3 of 30.17 inches of mecury barometric pressure at ground level is assumed empirically. As the sequential cam 10 begins to revolve, the cam riser 12 closes the sequential switch 81. The closing of the switch 81 applies ground from the conductor 14 and the switch 91 to the ring conductor 82, the contact 80, the units contact 1|, the zero contact of the terminal junction |40, and the relay winding |I4 to the power source |24. The resulting energization of the relay winding ||4 causes the switch ||0 to close. The closing of the relay switch ||0 causes the wire reproducer zero pick up head ||3, through the signal generator and pick up inductive winding |22 to cause to be transmitted to the homing pilot from the transmitter 53 the audio signal 0. The signal "0 indicates to the interrogating pilot that the barometric pressure at ground level at the field to which he is homing to the nearest units digit reading is inches of mercury.

The riser 12 on the sequencer cam 10 will then close the switch 88 and permit the switch 81 to again open. The closing of the switch 88 then applies ground to the ring contact 83 on the instrument dial 80. The application of ground to the ring contact 83, against which the connector 8| carried by the indicator arm 8| is pressed, applies ground to the tenths contact 18 and thereby, through the contact 1 of the terminal junction |40, to the relay winding I |5through which B+ power is supplied from the power source |24. The energization of the relay winding ||5 closes the switch ||8 and thereby energizes the 1 wire reproducer head ||1 and, through the couple comprising the signal generator III and the inductive winding |22, causes the word one" to be transmitted from the transmitter 53 to the interrogating pilot.

The riser 12 on the sequencer cam 10 next closes the switch and permits the switch 88 to open. Closing switch 85 applies ground to the contact 82 on the instrument beam 8|, to the hundredths contact 18 on the instrument dial 80, to the contact 7 of the connector |40 and through the relay winding ||8 to close the reproducer relay switch |9. On the resultant energization of the wire reproducer pick up head |20, the word seven is emitted from the transmitter 53 and is received by the homing pilot. The described transmission informs the interrogating pilot that the barometric pressure at the ground station to which he is approaching is 30.17 inches of mercury.

The above described operation continues to open such sequential switches as are added to the switches 85, 88 and 81 to thereby initiate the transmission of additional matters of information until such time as the rotation of the sequencer cam 10 opens the normally closed relay locking switch 98 and thereby interrupts the energization of the relay winding 98.

The interruption of the energization of the winding 98 interrupts the circuit through winding |04 opening the switches associated with both relay windings. The opening of the switch 92 stops the rotation of the motor 93. The opening of the switch 91 interrupts ground return to the sequential switches 85, 88, 81 etc. and to the solenoid relay winding 89. The opening of the switch 99 interrupts the energization of the transmitter 58. The de-energization of the solenoid relay winding 89 permits the upwardly spring pressed beam 88 to rise out of engagement with the instrument indicator arm 8|. The instrument arm 8| so released is again free to sweep the scale on the instrument dial 8l in response to changes in barometric pressure at ground level.

The simplied sequential relationship and operation oi the device as applied to the transmission to the interrogating pilot of the three words zero, one," and seven as described in connection with Fig. 3 of the accompanying drawings, is elaborated upon somewhat in Fig. 7. The circuits indicated in Fig. 7 comprises those of the sequencer 5I' and the wire reproducer 52'. In the sequencer 5|' part of Fig. 7 an illustrative plurality of sequential switches engaged by the riser 12 of the sequential cam 10 in consecutive order is illustrated by the sequential switches indicated by the letters a to s, inclusive, that are closed in their alphabetical order. Of these switches, that indicated by the letter s is the switch 98 in Fig. 3 and is maintained in closed condition until the end of a cycle of the device. The depression of the cycle starting key |02 results in the energizingof the relay windings 98 and |04 that holds closed the associated switches during the cycle so initiated. Closing of the switch 92 applies the potential of power source |5| to the motor 99 and thereby accomplishes the rotation of the sequencer cam 10 and the wire drum in the reproducer 52'. The resulting circuit associations are substantially a duplicate of those recited for the operation ot the circuit shown in Fig. 3 but of increased complexity in that the energization o! the relay y' 13 windinglll closestheswltch "andvpliel groundtotheleadnconnectedtoone contactof each of the switches d, e. t. n.1, k, m, n, 0. d. and r. e

The sequential switches a to :.inclusive, in Fig.

' sequencer cam 10 engages in alphabetical order switches a to r, inclusive, invapplying a number oi audio modulations to the carrier in the transimitter Bl with each rotation of the sequencer cam 1I and terminates a cycle by opening switch s. In Fig. 'I thel` connector |23 lis applied to the transmitter 53 and the connector i!" is applied to an instrument, such as the altimeter 50. The remaining connectors III, Ill, IIB. |51 and IBI from the sequencer l I are applied to correspondingly numbered primed connectors in Fig. 8. The primed connectors in' Fig. 8 are connected with calibration contacts on instruments in the modlned weather instruments Il group shown in Fig. 2.

' A more detailed showing of a plurality of instrument electrical connections for the modified weather instruments represented in Fig. 2 is shown in Fig. 8 of the drawings. In Fig. 8 all of the same numbers referring to instrument reading are connected to the same connector or plug-in-jack 59'. In Fig. 8` the altimeter calibrations are designated to conform with the corresponding-ly numbered contacts carried by the altimeter setting indicator arm 6| in Fig. 3 but primed in Fig. 8. With reference to the altimeter in Fig. 8 'the contact 80 is inV units corresponding in Fig. 3 to 28, 29, and v: 10 inches of mercury,A the tens places not being indicated since all altimeter readings at ground level would be within this range. is in tenths of an inch of mercury and the altimeter contact 22 is in hundredths of an inch mercury atmospheric pressure. The connector jack 59 conforms with the connector jack 59' in Figs. 2 and 3. The three contacts designated The altimeter contact 8|' ,i4 The sequencercam riser I2 next clcs'es'the switch Il! or b.' The closing of the switch |46 or b energizes the wire reproducer head |42 and plays back the word "weather" which is then' heard-by the interrogating pilot. The sequencer cam riser 12. as the cam Il continues to rotate. nextclosesswitch lorc. Theclosingoithe switch lll or c energiaes wire rem'oducer pick up head |43 to play back the word altimeter."

Continuing this rotation, the sequencer cam riser .12 next consecutively closes the switches 81, tl, and 8l or d, e. f. respectively, in that order. thereby playing back the readings in units. tenths and hundreths numbers of the reading upon the altimeter weather indicator III indicated in Fig. 8 as 20', 8|' and l2' respectively. As shown in Fig. 3 of the drawings. the words zero. one, seven" would be played back and are then .heard by the interrogating pilot in his ear phones. The numerical details of illustrative instrument connections are shown in Fig. 8 of the -drawings as modiiled weather instruments.,

In continuing this rotation, the riser 'I2 oi the sequencer cam 10 next consecutively closes the switches y to 1' inclusive, that report to the interrogating pilot the ceiling, visibility, wind speed and wind direction readings at the ground level of the beacon or the airport so interrogated.

With the closing of the sequential switch g the?- word ceiling is transmitted from the'transmitter 53. With the closing of the ceilometer switches h and i the reading from a ceilometer instrument comparable with the altimeter shown in Fig. 3 and connected in a circuit arrangement indicated in Fig. 8 of the drawings is applied' o ings as tens of hundreds of -feet ceiling and the by the letters C, U. G conform with clear ceilings, unlimited visibility and gusty winds, respectively, as indicated in Fig. 8. The altimeter contacts are grounded through leads to conductor |50 applied to sequencer 5| as described for Fig. 2.

In following through an illustrative sequence for one cycle of the sequencer cam 1|) applied to Figs. 7 and 8, the cam riser 12 consecutively closes the sequencer switches a to r, inclusive, in alphabetical order and opens the last switch s or .Si to terminate the cycle. When switch I or a of the alphabetical sequence is closed by operation of the cam 10, the wire reproducer pick up head |4| is connected into the wire reproducer play back circuit and causes to be emitted from the transmitter I3 the name of the site or airport where the beacon that is contacted by the interrogating pilot is located. Where the name ofthe airport so recorded on the magnetic tape is` Wright Field, then the carrier from the transmitter 52 is audioy modulated bythe words "Wright Field and the pilot hears these words in his ear phones as the riser 12 on the sequencer cam 1I closes the sequential switch Micra.

as audio modulation on the carrier emitted by the transmitter 53. The closing of the ceilometer sequential switch .h applies modulation taken from the tens chart |30 in Fig. 8 of the drawreading transmitted as carrier modulation on the closing of sequential switch i is taken from the units chart |l| in Fig. 8 as hundreds of feet ceiling from ground level. indicated in Fig. 8 is applied through connector 59' to the reproducer 52 when it is clear at ground level.l

In a similar manner the closing of the sequential switch `7" announces the word visibility in the ear phones of the homing pilot and the closing of the sequential switch k transmits the visibility at ground level in miles from-the instrument chart |32 or that visibility is unlimited as indicated in Fig. 8. f

The closing of the sequential switch l announces the words windspeedA to the homing The word "clear" pilot. The closing of the sequential switches m.

n, o in that order announce readings taken from the chart |35 in tens of miles per hour, from the 60 chart |36 in miles per hour and from the chart |24 thev word gus where such is the fact at vground level, and in that respective order. The

closing of the sequential switch p causes the words "wind direction to be received by the homing pilot in his head phones in tens of degrees The sequential switches a to s. inclusive, are

so spaced around the circumference of the circle through which the sequential cam riser 12 rotates as to cause pauses inthe transmission orinformation which substantially correspond to .75 pausesnormaltohumanspeech. Thuathewords which the -pilot hears when the sequential switches a to f inclusive, are closed by operation of'the sequencer cam l0 in the illustrative installation disclosed herein are Wright Field weather, pause, altimeter, pause, zero, one, seven, pause.- The sequence continues through a desired number of announcements and stops automatically when the normally closed switch s or Sisat the end of sequence is opened.

The last of the sequential switches contacted by the cam riser 'I2 is the switch 9E or s which is then opened from its normally closed position. The opening of the switch 96, as elsewhere described herein, interrupts the energization of the solenoid windings 98 and IM and thereby terminates one cycle of the sequential cam 10. When so terminated. the cam riser 'l2 passes from beneath the switch 96 so that the switch 96 is again closed preparatory to the starting of the next cycle upon the next closing of cycle initiating key |02.

It will be apparent that substantially any information of a recurrent nature and which may be set up on a key board and adapted for sequential telemetering may be transmitted by the equipment that is disclosed herein. In reading from an instrument, such as that shown in Fig. 3 of the accompanying drawings, it will be noted that the connection of all members of the decimal system there used may be connected in the conductor 59 by the use of ten wires and that but three wires lead from theinstrument dial to the connector |50. It will bew apparent therefore that sequential telemetering is accomplished in the disclosed installation with the use of a minimum'number of wires. It will be further noted in the disclosed adaptation of the present invention when sequential telemetering is accomplished for a wide range of information the use of standard transmitter and receiving devices is practical. Audio carrier modulation for the 'transmission of intelligence in the disclosed adaptation of the present invention is preferred and is fixed, since spoken words minimize observation errors in making instrument readings and in the interpretation of such readings at remote points. Automatic telemetering by voice eliminates the need for specially trained observers at the reception point to decode the telemetered information.

In addition to the particular use that is presented. illustratively herein it will be apparent that the present invention is adapted for being applied to radiosonde instruments; to automatic weather stations; to ground control approach radio and the like wherein a plurality of digits, words or combinations of words, are required to be telemetered to remote points or to be announcedautomatically. The disclosed invention is adapted for more prosaic use in the announcing of station names in airplanes, trains, busses, and the like; in the automatic announcing of floors and associated recurrent information in the elevators of department stores, other business buildings and the like; and in warning devices either by radio or telephone for automatic voice transmission from burglary, tire alarms or the like, to be intercepted at a watch station that is to be informed of the exact location and nature of the danger.

1t is to be understood that the detailed presentation shown in the accompanying drawings and described through sequential circuit connections has been submitted for the purposes of illustrating and explaining and operative embodi- 16 ment of the present invention and that similarly operating instrument adaptations may be substituted therefore without departing from the scope of the present invention. /1'

What I claim is: fx,

l. n intelligence transmitting radio system, comprising the combination of a transmitter for transmitting radio signals. an instrument supplying intelligence to be transmitted by said transmitter, an instrument scale of fixed separately insulated instrument calibrating circuit contacts as part of said instrument, an upwardly spring pressed instrument indicator arm adapted for freely sweeping said instrument scale fixed contacts and bearing a contact for connecting said instrument scale contacts in pairs to provide intelligence. from the operation of said instrument by the forceable'depression against the spring pressure of said indicator arm downwardly against said fixed contacts for completing a circuit therebetween, an instrument beam ior keeping the contact on the instrument indicator arm into engagement with said iixed contacts of said instrument during the transmission of intelligence therefrom, an instrument solenoid attracting at least one end of said instrument beam as an armature to make the connection between the instrument scale contacts and the contact on said instrument indicator arm, a sequencer determining the order and timing of the transmission of intelligence supplied by said instrument from the engagement of the instrument indicator arm carried contact with the instrument fixed contacts, and means for applying upon a carrier from said transmitter an audio modulation signal initiated at the engagement by the contact on said instrument indicator arm with said fixed contacts oi said instrument in an order and timing controlled by said sequencer.

2. An electrically operated automatic intelligence transmitting means serving to supply ground station information to an airborne interrogator upon receiving an interrogating signal therefrom, comprising the combination of a sequencer, a cycle starting switch in said sequencer that is closed to start a sequence of signal transmissions in response to the interrogating signal from the airborne interrogator, a holding relay winding in said sequencer and energized by said cycle starting switch, a motor driving relay winding in said sequencer and energized by the energization of said holding relay winding, a plurality of sequential switches in said sequencer and to which ground is consecutively applied from said motor driving relay winding, a rotatable cam in said sequencer separately and sequentially actuating said plurality of sequential switches, a motor energized upon the energization of the motor driving relay winding in said sequencer to turn the cam therein for consecutively operating the sequential switches therein and ultimately terminating the sequence of signal transmissions, an instrument for supplying intelligence, an instrument dial, a plurality of circularly discontinuous sector contacts on said instrument dial and insulated from -each other, a plurality of circularly continuous contact rings on said instrument dial and insulated both from each other and from said discontinuous sector contacts, a rotatable instrument indicator arm mounted for rotation centrally of said instrument dial, spring means supporting said instrument arm up out of engagement with the instrument dial contacts for the unimpairedv sweeping of said arm thereover,

assura 17 arm contact carried by said instrument indicator arm and adapted i'or connecting a dial sector contact with a dialfcontact ring upon the spring opposed depression of'said arm, a contact making instrument beam depi'eed upon the closing or one oi' said sequential switches lor causing the depression ofthe instrument arm against the yielding resistance of said arm supporting spring means and accomplishing the electrical engagement of the arm contact with a sector contact and a contact ring, a multiple terminal instrument junction to which all numeral indicatlng contacts on the instrument dial are connected electrically, reproducer means connected electrlcally to and receiving the output from the multiple terminal instrument junction and actuated mechanically from-said motor, and transmitter means started and stopped by the sequencer motor driving relay winding and connected electrically with tlie-reproducer means for transmitting orally datum readings from said instrument.

3. A radio signal transmission system, comprising a transmitter. a data supplying `instrument connected with said transmitter, a dial on said instrument, a plurality of instrument contacts indicating the' calibration or saidinstrument dial, a contact bearing instrument arm freely sweeping the contacts on said instrument dial and adapted to be depressed thereagainst for the providing of data forlradlation from said transmitted, a beam overlying said instrument arm, a sequencer controlling the starting, the sequential order .and the Stopping of the transmission oi' data from the system during a cycle of operations, a cycle starting key in said sequencer for starting a data transmitting cycle, a

solenoid relay energized with each closing of said cycle starting key for depressing said instrument beam on said instrument arm,-a plurality of' sequencer switches in said sequencer individually connected to said solenoid relay and to said instrument dial contacts, a sequencer cam successively actuating said sequencer switches, a motor driving said sequencer cam continuously during each data transmitting cycle, and a signal generator supplying to4 said transmitter a carrier modulated by signal from said instrument contacts engaged by the contacts on said instrument arm. f y

4. An electrically operated automatic intelligence transmitting means serving to supply ground station information to an airborne interrogator upon receiving an interrogating signal therefrom, comprising the combination of a sequencer. a cycle starting switch in said sequencer that is closed to start a sequence 'or signal transmissions in response to the interrogating signal from the airborne interrogator, a holding relay winding in said sequencer and energiaed by said cycle starting switch, al motor driving relay winding in said sequencer and encrgized by the energizatlon of said holding relay winding. a plurality of sequential switches in said sequencer and to which ground is consecutively other, a plurality o! circularly continuous contact rings on said instrument dial and insulated both from each other and from said discontinuous sector contacts, a rotatable instrument indicator yarm mounted for rotation centrally ot ysaid instrument dial, spring means supporting said instrument arm up out oi' engagement with the instrument dial contacts lor unimpaired sweeping of said arm thereover, an arm contact carried by said instrument indicator arm and adapted for connecting a dial sector contact with a dial contact ring upon the spring opposed depression oi' said arm, a contact making instrument beam depressed upon the closing oi one of said sequential switches for causing the depression or' the instrument arm against the yielding resistance o'i said arm supporting spring means and accomplishing the electrical engagement ofV trie arm contact with a sector contact and a contact ring, a multiple terminal instrument junction to which ally numeral indicating contacts on thelnstrument dial are connected electrically. reproducer means actuated mechanically from said motor and selectively connected electrically to andreceiving the output irom a plurality of wire yreproducer pick-up heads and from the multiple terminal instrument junction. and transmitter means started and stopped by the Y sequencer motor driving relay winding and connected electrically with the reproducer means for transmitting orally statements irom said wire reproducer pick-up heads and datum readings from said instrument.

5. An electrically operated automatic intelli-v gence transmitting means serving to supply ground station iniormation to an airborne interrogator upon receiving an interrogating signal therefrom, comprising the combination ot a sequencer, a cycle starting switch in said sequencer that is closed to start a sequence of signal transmissions in response to the interrogating signal Irom the airborne interrogator. a holding relay winding in said sequencer and energized by said cycle starting switch, a motor driving relay winding in said ysequencer and energized by the energization of said holding relay winding, a plurality of sequential switches in said sequencer and to which ground is consecutively applied from said motor driving relay winding, a rotatable cam in said sequencer separately and sequentially actuating said plurality of-se quential switches. a motor energized upon the energlzation of the motor driving relay winding in said sequencer to turn the cam therein for consecutively operating the sequential switches therein and ultimately terminating the sequence of signal transmissions, an instrument for supplying intelligence, an instrument dial, a plurality of circularly discontinuous sector contacts on said instrument dial and insulated from each other, a plurality of circularly continuous contact rings on said instrument dial and insulated both from each other and from said discontinuous sector contacts, a rotatable instrument indicator arm mounted for rotation centr-ally of said instrument dial, spring means supporting said instrument arm' up out of engagement with the instrument dial lcontacts for the unimpaired sweeping of said arm thereover, an arm contact `carried by said instrument indicator arm and adapted for connecting a dial sector contact with a dial contact ring upon the spring opposed de-v pression of said arm, an instrument beamdepressed upon the energlzation of one of said sequential switches to close circuit between one of 19 said continuous contact rings with one of said discontinuous contacts on the instrument dial, a multiple terminal connector to which said electrical contacts are connected, and a transmitter for transmitting through said terminal connector intelligence from said instrumentcontacts.

6. An electrically operated automatic intelligence transmitting means serving to supply ground station information to an airborne interrogator upon receiving an interrogating signal therefrom, comprising the combination of a sequencer, a cycle starting switch in said sequencer that is closed to start a sequence of signal trans missions in response to the interrogating signal from the airborne interrogator, a holding relay winding in said sequencer and energized by said cycle starting switch, a motor driving relay winding in said sequencer and to which ground is consecutively applied from said vmotor driving relay winding, a rotatable cam in said sequencer separately and sequentially actuating said plurality of sequential switches, amotor energized upon the energization of the motor driving relay winding in said sequencer to turn the cam therein for consecutively operating the sequential switches therein and ultimately terminating the sequence of signal transmissions, an instrument for supplying intelligence, an instrument dial, a plurality of circularly discontinuous sector contacts on said instrument dial and insulated from each other, a plurality of circularly continuous contact rings on'said instrument dial and insulated both from reach vother and from said discontinuous sector contacts, an instrument arm selectively connecting said discontinuous sector contacts with said continuous contact rings, a plurality of electrical contacts indicating information associated with information from said instrument contacts, a multiple terminal connector to which said contacts are connected, and transmitter means radiating signal from said connector.

'7. An electrically operated automatic intelligence transmitting means serving to supply ground station information to an airborne interrogator upon receiving an interrogating signal therefrom, comprising the combination of a sequencer, a cycle starting switch in said sequencer that is closed to start a sequence of signal transmissions in response to the interrogating isnal from the airborne interrogator, a holding relay winding in said sequencer and energized by'said cycle starting switch, a motor driving relay winding in said sequencer and energized by the energization of said holding relay winding, a plurality of sequential switches in said sequencer and to which ground is consecutively applied from said motor driving-relay winding, a rotatable cam in said sequencer separately and sequentially actuating said plurality of sequential switches, a motor energized upon the energization oi the motor driving relay winding in said sequencer to turn the cam therein for consecutively operating the sequential switches therein and ultimately terminating the sequence of signal transmissions, an instrument for supplying intelligence, a plurality of instrument electrical contacts indicating instrument readings, a contact bearing depressible instrument hand engaging said instrument electrical contacts, means for depressing said instrument hand, a plurality of electrical contacts indicating information associated with information from said instrument contacts, a multiple terminal connector to which said electrical contacts are connected, and transmitter means radiating signal from said connector.

" DAVID ATLAS.

`REFERENCES `CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 835,840 Strassweg Nov. 13, 1906 1,146,486 Durr July 13, 1915 1,530,363 Hayden Mar. 17, 1925 1,673,369 Mills June 12, 1929 1,913,511 Reynolds June 13, 1933 1,931,091 Smith Oct. 17, 1933 1,967,778 Myers 1--- July 24, 1934 1,972,289 Chauveau Sept. 4, 1934 2,047,900 Bruckel July 14, 1936 2,224,244 Hicks Dec. 10, 1940 2,444,106 Miles June 29, 1948 2,444,818 Franklin July 6. 1948 

